Ultra-thin gates for the transport of phenol from supported liquid membranes to permanent surface modified membranes

Behavior of hydrophobic ionic liquids as liquid membranes on phenol removal: Experimental study and optimization

“…In other words, the activity of unreacted molecular phenol slowed down the stripping process by reducing the concentration gradient between membrane and stripping phases under low NaOH concentration, thus reducing the stripping rate and efficiency. This is supported by the works of Le et al [8] and Xiao et al [29] who claimed that the stripping process can be optimized and the incomplete reaction can only be prevented by maintaining pH > pKa by at least 2 units (high NaOH concentration) for the stripping phase. Since the activity of phenol was not suppressed by NaOH, the molecular phenol in the stripping phase started to reduce the stripping rate via reduction on the concentration gradient between the membrane phase and the stripping phase.…”

“…Applications of liquid membranes in separation field have been reported by a number of researchers, mainly for the separation of organic compounds [3,6,8,12] and metal ions [9,13]. However, the utilization of organic membrane solvents such as hydrocarbons and chloroalkanes [3,6,[8][9][10][12][13] have their drawbacks as they are usually volatile, flammable and often toxic, thus restricting their applications in the industries.…”

Recovery of phenol from aqueous solution by supported liquid membrane using vegetable oils as liquid membrane

“…In LMs linear monoalkyl cyclohexane [18], N,N-di (1-methyl heptyl) acetamide [19], dibenzo-18-crown-6 [20], dodecane [21], trioctylamine [22], N-octanoylpyrrolidine [23] have been reported, all of which are synthetic toxic chemicals. The solvents generally used for the liquid membrane processes are typically flammable, volatile, toxic and their use leads to environmental and safety risks.…”

Soft and Hard Surface Manipulation of Nanoporous Anodic Aluminum Oxide (AAO)

“…Adapted with permission from [7] immersion of freshly prepared membrane into dilute alkylthiol in an ethanoic solution for 12-24 h at room temperature. A series of experiments were carried out by Le et al [11] for separation studies using five different kinds of thiol-modified gold coated AAO membranes. These studies suggested that highly polar carboxylic group increases the hydrophilicity while non-polar alkyl group increases the hydrophobicity of the golad-coated AAO membrane.…”